<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <!-- 绝对路径 -->
  <!-- <link rel="stylesheet" href="http://xiaohigh.com/css/app.css">
  <link rel="stylesheet" href="//xiaohigh.com/js/app.js">
  <link rel="stylesheet" href="/img/logo.png"> -->

  <!-- 相对路径 -->
  <link rel="stylesheet" href="./css/app.css">
</head>
<body>
  <h2>绝对路径</h2>
  <a href="http://www.baidu.com/s?wd=你好">测试</a>

  <form action="/abc">
    <button>发送</button>
  </form>

  <img src="./abc/1.jpg" alt="">

</body>
</html>